driver: net: dpaa: support interface mode usxgmii

According to upsteam commit ce64c1f7

("net: phy:
aquantia: add USXGMII support and warn if XGMII mode is set ").
When using aquantia phy(e.g AQR107), it needs to support
usxgmii interface mode in network driver.

Signed-off-by: Meng Li <Meng.Li@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>